15N isotope effects on the vibrational frequencies of aniline and assignments of the frequencies of its nh2 group |
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| Affiliation: | 1. Key Laboratory of Coal Processing and Efficient Utilization, Ministry of Education, China University of Mining & Technology, Xuzhou 221116, China;2. State Key Laboratory of High-efficiency Coal Utilization and Green Chemical Engineering, Ningxia University, Yinchuan 750021, China |
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| Abstract: | Abstract-Infrared absorptions of aniline in which 31·9 per cent of nitrogen is 15N and 68·1 per cent is 14N were examined in dilute CCl4 and CS2 solutions by means of a grating instrument. For five bands at 3481·4, 3395·2, 1618·9, 1276·1 and 1114·6 cm−1 appreciable isotope shifts were observed. It was shown that these bands are to be assigned, respectively, to NH2 antisymmetric stretching, NH2 symmetric stretching, NH2 bending, C-N stretching and NH2 rocking (or twisting) vibrations. |
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